Improve the error message when users have gpg signing turned on

[stefanhaller]

• PR Description

It is not obvious that you can get rid of the error by using the overrideGpg config, so tell them.

Improves #4293 and #3758.

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
Report missing for f05f81d1	✅ 100.00%

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (f05f81d)	Report Missing	Report Missing	Report Missing
Head commit (96934d5)	53088	45978	86.61%

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#4296)	1	1	100.00%

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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